Any info for use withta dt25/50 amp? dual paths, cab modelling, the point in the chain where channel volume and master volumes are placed,and summing etcwhen output is unexplained with a line6 link to a dt25 amp..
Especially when low volume gets engaged, and the use of the direct out. whats going on in the chain there is a total mystery, and I've received conflicting explanations the few times I asked line6 support, so I guess they don't understand it either.

I'm a bit of a noob when it comes to the HD 500. Does the "post" position mean that it is modeling effects in the effects loop of the modeled amp or effects put on the signal between the microphone and mixer in a studio setup? To put it another way, is "post" post pre-amp or post amplifier? Thanks.

The pre/post terminology applies directly to the POD HD Looper. If that's what you are talking about, it's much simpler than you think.

Pre means the looper records the incoming signal directly from the source(s), before it enters the DSP chain. This is used to record a dry signal and then tweak the tone hands-free (and/or change presets to hear the differences) while the looper plays back the recording for you.

Post means the looper records the fully processed signal, the same signal that is sent to the HD outputs. This is useful to record a backing track (e.g. A chord sequence) and then use it to play solo on top of using a different tone/preset.

If you are talking about the POD HD FX loop, that's a completely different thing and the pre/post terminology doesn't really apply. You can position the FX Loop anywhere you like in the signal chain, and using the 4-cable method you can fully control its position relative to the amp's preamp and power amp sections.

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Sorry, I must not have been clear. If I put an effect before the amplifier in the signal chain I understand that it is simulating plugging my guitar into an effect and then plugging the effect into an amplifier. If I move that effect to after the amp in the Pod's signal chain (either in path A or B or after the mixer), is that simulating putting an effect in the simulated amp's effects loop? I'm not asking about the effects loop on the Pod or a looper. Thanks again for responding.

Another two things I feel I need to clarify on your schematics for people that are trying to learn from this thread:

3- the two big schematics (with and without "pre split" FX) are exactly the same,

in fact I think darwan23 could get rid of the first one

the difference resides in which kind of effect someone chooses to put before the split, if it's stereo it will leave A and B paths separated

if it's mono or "mono fx / stereo thru" it will do what their schematics show

4- the continuous vs dotted lines to distinguish between mono and stereo signals could be confusing, in the sense that the dotted lines labelled L and R could also be representing two identical signals running in parallel which IS mono... it all depends on which effect you put where

also the two inputs could carry two sides of a stereo signal so the continuous lines could refer to a stereo and not mono signal

what I'm triying to say is that in darwan23's schematics there is no difference between what is drawn in continuous or in dotted fashion (it could be all continuous and work the same)

Another problem I noticed, is when I have a dual signal and I'm just using Path A for my guitar, if I'm using my POD as an audio interface and the looper as post, the looper is half as quiet than the guitar signal, so it's not really usable when doing this.

Perhaps a simple best practice is to always set input 2 to "Same" unless you are using two separate instruments with input 1 going directly to path A and input 2 going directly to path B. Then the mono/stereo/amp effects work as expected in both paths.

there really should be stereo effects only in a HD device. with a spread/width parameter and a mono switch. all the distortions and wahs dont take a lot of dsp anyways, and a stereo version would likely take less than twice the dsp of the same mono effect.

So my question is: Is it possible to use this method to hook up 2 separate guitar amps and use a different "amp block?" for each one? I realize it wouldn't be stereo but the amps are older Peavey Bandit 112 (silver stripe versions) . I like the POD so much through the effects loop of the one I bought another thinking I can have the fullness of two amps while playing. Or is the answer to my question elsewhere? Thanks for the knowledge here, I'll have to really study this stuff.

If the mixer is absolutely the first thing in the chain, that means the second thing is the amp, which also means you can't have any effects before the amp. That's just the way it is when you try to do this. You can have effects before the mixer on either path while the amp remains after the mixer, so that would be the biggest benefit. You could set it up so that you could "pan" between the two paths, or two different effect setups, before it hits the amp, without actually using two amps.